Driving device for pendulum-mills.



'PATENTEII APR. 18,1905. l I. IJRNIIOLZ y DRIVING DEVICE POR PENDULUM MILLS.

APPLICATION FILED JULY 7, N04.

v IIIVEILUII;

WHILE SS @M UNITED STATES Patented April 1s, 1905.

PATENT OEEICE.,

DRIVING DEVICE FOR PENDULUNl-IVIILLS.

SPECIFICATION forming part of Letters Patent N0. '7S-7,787, dated April 18, 1905.

Application filed July 7, 1904. Serial No. 215,592.

To all whom, t may con/cern:

Beit known that I, JACOB DRNHoLZ, a subject of the German Emperor, and a resident of Kalk, Germany, have invented certain new and useful Improvements in Driving Devices for Pendulum-Mills, of which the following is a specification.

This invention has for its object a driving device for one-pendulum mills which differs from the devices now in use for the same purpose (in which universal joints are used) by its great simplicity and reduction of friction, the slidingl friction being replaced by a rolling friction.

The essential feature of the invention is that between two disks, of which oneis driven from outside and the other is rigidly connected to the mill-pendulum, there is inserted near the periphery a rolling body of such a shape and size that the disk connected to the pendulum is brought into a position forming an angle with that of the other disk, and as soon as the latter is rotated the pendulum, which forms an acute anglewith a perpendicular line and presses against the grinding-surface, is rolled around in a circle.

In Figures l to 5 of the accompanying drawings, in which similar letters refer to similar parts throughout the several views, dierent forms of construction of the invention are shown, all in vertical section.

Fig'. 1 represents the whole pendulum-mill, with the new driving device in a longitudinal section. The pendulum-rod L, entering at the lower end the casing a, containing the grinding-surface, with the grinding-body g and the stirring-wings r, is provided at the upper end with a disk b, at the bottom surface of which there is aiixed-by means of pinsf, for instance-the upper winding of a strong screw-spring c, fastened at the bottom to the protecting-case Z through screws e or any other means. At some distance above the disk is provided a second disk m, provided at its bottom side near its periphery with a circular running-groove Z, on the vertical shaft a' of which disk there is fastened and pivotably journaled a driving devicefor instance, a belt-pulley 7c. Between the disks m and I) is inserted a suitable rolling body-in this case a ball n, running in the circular groove Z, and this ball is of such a size or the distance between the two disks is such that the windings of the spring c are compressed on one side, and the pendulum-rod is pressed out of the vertical middle line of the grinding-surface a in a manner that the circumference of the grinding-body g exerts a strong pressure against the grinding-surface a. If the disk m is put in rotation, it rolls the ball a. In consequence of the pressure on the same disk is thereby also rotated and through the pressure of the spring c changes its position .with regard to the axis of the grinding-surface. The latter consequently swings in a circle. The pendulum z g in swinging around in a circle does not rotate on its own axis for the reason that it is connected to the spring c and the latter to the casing. The grinding-roller g does not, therefore, entirely or only roll upon the grinding-surface a, but at each swing it slides upon the same for a certain distance. Such a movement of the pendulum has a double advantage. In the first place the grain after having been crushed, as by a perfect rolling of the roller against the grinding-surface, is also pulverized, in consequence of the sliding, a circumstance which makes this new mill especially suitable for fine grinding and prevents at the same time a baking together of a material which perhaps requires to be damped. It is evident that this kind of trituration must necessarily shorten and facilitate the grinding process. The bearings of the driving parts can, moreover, in this way be perfectlyy and easily protected against outside influences, as the part of the pendulum-shaft projecting from the bearing may be firmly united with the frame of the machine bya movable girdle or bolter s of india-rubber, leather, and so on, so that no dust can enterthe bearing and no oil can run out into the grinding-space.

In the form of construction shown in Fig. 2 the pendulum-rod L is guided in a certain manner by a bolster or neck bearing ring 0, shiftable in the casing CZ, in which ring it rests by means of a rounded appendage or shoulder p. The ring 0 is therefore pressed with the disk Z1 against m. In other respects IOO the working is the same as in the construction shown 1n Fig. l.

In the construction according to Fig. 3

l the rolling body n is not pressed by means of a spring between the disks 'm I), but by a weight. This is effected by providing on the casing c a U-shaped arm e with the bent upward, to which is joined a lever carrying' a Weight q. This lever resting on the end of the axle t', which is axially shiftable within narrow limits, presses the disk m'against b. The pendulum-rod connected to the latter, and which is now movable in every direction in a fixed ball-bearing ring 0, is again, through the rotation of fm, caused to swing in a circle. Arm z5 can also be dispensed with if the weight of m z' is sufficient to move the pendulum-rod out of its vertical direction.

F ig. 4 shows the case in which instead of a spring c the elasticity of an india-rubber ring w is used to effect a raising of the device pressing the disks together. In Fig. 5 finally is shown that instead of the ball n any other rolling device-for instance, an egg-shaped one ro-may be used, which in this case, however, would require to be held by an axle y, bent into an angle and loosely pivotable in 71,

disk m being rotated from the outside and the pendulum, being by springs pressed against the rolling body, is moved thereby out of its perpendicular central position into an inclined position with regard to the grinding-surface,

which position is. in consequence of the rotation of the disk fm and the rolling around in a circle of the rolling body constantly changed, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JACOB DRNHGLZ.

Witnesses:

HENRY QUADFLIEG, E. M. BRUNDAGE. 

